In the BitTorrent file distribution system, a torrent file is a computer file that contains metadata about files and folders to be distributed, and usually also a list of the network locations of trackers, which are computers that help participants in the system find each other and form efficient distribution groups called swarms.
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KickassTorrents (commonly abbreviated KAT) is a website, founded in 2008, that provides torrent files and magnet links to facilitate peer-to-peer file sharing using the BitTorrent protocol.
It indexes only publicly tracked torrents from various sources including the BitTorrent DHT bittorrent network and offers compilations of various trackers per torrent in magnet links that are not necessarily present in the original .torrent file, so that when a tracker is down, other trackers can be used to retrieve peer data.